Tower system of fortifications



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(No Model.) 4 Sheets-Sheet 1.

T. R. TIMBY.

i REVOLVING TOWER SYSTEM OF FORTIPIGATIONS.

No. 330,641. Patented Nov. 17, 1885. I

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REVOLVING TOWER SYSTEM OF FORTIFIGATIONS. No. 330,641. Patented Nov. 17.1885.

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I T. R. TIMBY. REVOLVING TOWER SYSTEM OF PORTIPIGATIONfi- No. 330,641.

Patented Nov. 17, 1885.

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(No Model.) 4 Sheets-Sheet 4. T. R. TIMBY.

REVOLVING TOWER SYSTEM OF FORTIFIOATIONS. No. 330,641. Patented Nov. 17,1885.

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UNITED STATES saa PATENT OFFICE.

THEODORE R. TIMBY, OF NYAOK, NEW YORK.

REVOLVING-TOWER SYSTEM OF FORTIFICATIONS.

SPECIFICATION forming part of Letters Patent No. 330,641, dated November17, 1885. Application filed February 5, 1885. Renewed September 21,1885. Serial No. 177,777. (No model.)

To all whom it may concern.-

Be it known that I, THEODORE R. TIMBY, a citizen of the United States,residing at Nyack, in the county of Rockland and State of New York, haveinvented a new and useful Improvement in Revolving-Tower Systems ofFortifications, of which the following is a specification.

This invention relates to an improved mode of constructing the walls ofrevolving towers and the foundations thereof, so as to increase theirstrength and rigidity.

To this end I construct such walls of plates of cast-steel or othermetal set together with V-shaped joints on both their vertical andhorizontal edges, two or more thicknesses of such plates being socombined as to break joints,and the whole secured together by horizontalconical bolts driven from the outside and riveted on their inner ends.

In the accompanying drawings, Figure I is an elevation of a revolvingbattery-tower illustrating the invention, the last plate of a seriesbeing shown detached in order to illustrate the mode of inserting it.Fig. II is an elevation of the same,partly in section. Fig. III is adetail sectional view,on a larger scale, showing the form and mode ofapplication of the conical bolts. Fig. IV is a top view. Fig. V is adetached perspective View of one of the plates on a larger scale. Fig.VI is'a horizontal section of the same. Fig. VII is a vertical sectionthereof.

Each of the plates 1 of which the walls of the tower are composed isformed, as represented in Figs. V, VI, and VII, with a V- shaped tongueor saddle, 2, on its upper edge and a similar salient V-shaped edge ortongue, 3, at one vertical end, and with V-shaped grooves 4 5 at bottom,and at the other vertical end corresponding in shape to the V-shapededges 2 and 3, respectively. The plates thus formed are put together,asillustrated in Figs. II and IV, the salient V-shaped edge 3 of eachplate being fitted within a counterpart V- shaped groove, 5, in thepreceding plate completely around the tower until one course of a singlethickness of plates is completed with the exception of the last plate.This is then slid in from above, as illustrated in Fig. I in the case ofthe last or upper course.

A second course is then laid on the same,the grooves 4 fitting over thesaddles 2 of the course below, and so on. The central shell, 6, beingcompleted in this way a second shell, 7, is built in the same way on theoutside,breaking joints between the two shells or vertical courses 6 and7, as illustrated in Fig. IV, and also between the horizontal courses,as illustrated in Figs. I and II. An inner facing-shell, 8, may be addedin like manner, if desired, and the wall may of course be extended toany required thickness, and with any desired number of shells orthicknesses of plates. The wall being thus built in any desired numberof shells or thicknesses of plates,the said shells and the platescomposing them are securely tied together by bolts 9,0f conicalform,tapering toward their inner ends, driven from the outside andsecurely riveted at their inner 7o ends over the inner surface of thewall, as shown in Fig. III, or in countersinks in the inner shell, 8, asseen in Fig. II. It will be apparent that conical bolts 9,driven fromthe outside,are free from any liability of being iujured or loosened bythe impact of projectiles. Suitable port-holes are shown at 10 for thecasemates and at 11 for guns in barbette.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent- A fortification-wallconstructed of a number of shells or series of plates formed withcounterpart V-shaped ridges and grooves, respectively, on their meetingedges, so as to in- 8 5 terlock, the whole secured together byhorizontal conical bolts inserted from the exterior, as herein shown anddescribed.

THEODORE R. TIMBY.

Witnesses:

OOTAVIUS KNIGHT, L. M. HOPKINS.

